<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>菜鸟教程(runoob.com)</title>
    <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
    </script>
    <script>
        $(document).ready(function() {
            $("input").focus(function() {
                $(this).css("background-color","#cccccc");
            });
            $("#one").blur(function(){
                $(this).css("background-color","#ffffff");
            });
        });
    </script>
</head>
<body>

Name: <input type="text" name="fullname"><br>
Email: <input type="text" id="one" name="email"><br>
pass: <input type="password" id="trow" name="pass">


</body>
</html>